package com.android.pay.alipay;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Random;

/**
 * 2.0 订单串本地签名逻辑
 * 注意：本 Demo 仅作为展示用途，实际项目中不能将 RSA_PRIVATE 和签名逻辑放在客户端进行！
 */

public class OrderInfoUtil {

    /**
     * 构建授权信息
     *
     * @param privateKey 私钥（https://doc.open.alipay.com/docs/doc.htm?treeId=291&articleId=106097&docType=1）
     * @param pid        签约的支付宝账号对应的支付宝唯一用户号，以2088开头的16位纯数字组成
     * @param app_id     支付宝分配给开发者的应用ID
     * @param target_id  商户标识该次用户授权请求的ID，该值在商户端应保持唯一
     * @param rsa2       签名类型是否是RSA2,否：RSA
     * @return
     */
    public static String buildAuthInfo(String privateKey, String pid, String app_id, String target_id, boolean rsa2) {
        Map<String, String> authInfoMap = buildAuthInfoMap(pid, app_id, target_id, rsa2);
        String info = buildOrderParam(authInfoMap);
        String sign = getSign(authInfoMap, privateKey, rsa2);
        return info + "&" + sign;
    }

    /**
     * 构造授权参数列表
     *
     * @param pid
     * @param app_id
     * @param target_id
     * @param rsa2
     * @return
     */
    public static Map<String, String> buildAuthInfoMap(String pid, String app_id, String target_id, boolean rsa2) {
        Map<String, String> keyValues = new HashMap<String, String>();
        // 商户签约拿到的app_id，如：2013081700024223
        keyValues.put("app_id", app_id);
        // 商户签约拿到的pid，如：2088102123816631
        keyValues.put("pid", pid);
        // 服务接口名称， 固定值
        keyValues.put("apiname", "com.alipay.account.auth");
        // 服务接口名称， 固定值
        keyValues.put("methodname", "alipay.open.auth.sdk.code.get");
        // 商户类型标识， 固定值
        keyValues.put("app_name", "mc");
        // 业务类型， 固定值
        keyValues.put("biz_type", "openservice");
        // 产品码， 固定值
        keyValues.put("product_id", "APP_FAST_LOGIN");
        // 授权范围， 固定值
        keyValues.put("scope", "kuaijie");
        // 商户唯一标识，如：kkkkk091125
        keyValues.put("target_id", target_id);
        // 授权类型， 固定值
        keyValues.put("auth_type", "AUTHACCOUNT");
        // 签名类型
        keyValues.put("sign_type", rsa2 ? "RSA2" : "RSA");
        return keyValues;
    }

    /**
     * 构造支付订单参数列表
     */
    public static Map<String, String> buildOrderParamMap(String app_id, boolean rsa2) {
        Map<String, String> keyValues = new HashMap<String, String>();
        keyValues.put("app_id", app_id);
        keyValues.put("biz_content", "{\"timeout_express\":\"30m\",\"product_code\":\"QUICK_MSECURITY_PAY\",\"total_amount\":\"0.01\",\"subject\":\"1\",\"body\":\"我是测试数据\",\"out_trade_no\":\"" + getOutTradeNo() + "\"}");
        keyValues.put("charset", "utf-8");
        keyValues.put("method", "alipay.trade.app.pay");
        keyValues.put("sign_type", rsa2 ? "RSA2" : "RSA");
        keyValues.put("timestamp", "2016-07-29 16:55:53");
        keyValues.put("version", "1.0");
        return keyValues;
    }

    /**
     * 构造支付订单参数信息
     *
     * @param map 支付订单参数
     * @return
     */
    public static String buildOrderParam(Map<String, String> map) {
        List<String> keys = new ArrayList<String>(map.keySet());
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < keys.size() - 1; i++) {
            String key = keys.get(i);
            String value = map.get(key);
            sb.append(buildKeyValue(key, value, true));
            sb.append("&");
        }
        String tailKey = keys.get(keys.size() - 1);
        String tailValue = map.get(tailKey);
        sb.append(buildKeyValue(tailKey, tailValue, true));
        return sb.toString();
    }

    /**
     * 拼接键值对
     *
     * @param key
     * @param value
     * @param isEncode
     * @return
     */
    private static String buildKeyValue(String key, String value, boolean isEncode) {
        StringBuilder sb = new StringBuilder();
        sb.append(key);
        sb.append("=");
        if (isEncode) {
            try {
                sb.append(URLEncoder.encode(value, "UTF-8"));
            } catch (UnsupportedEncodingException e) {
                sb.append(value);
            }
        } else {
            sb.append(value);
        }
        return sb.toString();
    }

    /**
     * 对支付参数信息进行签名
     *
     * @param map 待签名授权信息
     * @return
     */
    public static String getSign(Map<String, String> map, String rsaKey, boolean rsa2) {
        List<String> keys = new ArrayList<String>(map.keySet());
        // key排序
        Collections.sort(keys);
        StringBuilder authInfo = new StringBuilder();
        for (int i = 0; i < keys.size() - 1; i++) {
            String key = keys.get(i);
            String value = map.get(key);
            authInfo.append(buildKeyValue(key, value, false));
            authInfo.append("&");
        }
        String tailKey = keys.get(keys.size() - 1);
        String tailValue = map.get(tailKey);
        authInfo.append(buildKeyValue(tailKey, tailValue, false));
        String oriSign = SignUtils.sign(authInfo.toString(), rsaKey, rsa2);
        String encodedSign = "";

        try {
            encodedSign = URLEncoder.encode(oriSign, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return "sign=" + encodedSign;
    }

    /**
     * 要求外部订单号必须唯一。
     *
     * @return
     */
    private static String getOutTradeNo() {
        SimpleDateFormat format = new SimpleDateFormat("MMddHHmmss", Locale.getDefault());
        Date date = new Date();
        String key = format.format(date);
        Random r = new Random();
        key = key + r.nextInt();
        key = key.substring(0, 15);
        return key;
    }

}
